Buggy code:
public class GenClass extends Generator < Clazz > { public static final String PROPERTY_FILEPATH = "filePath" ; private String filePath ; private LinkedHashMap < String , String > constantDecls = new LinkedHashMap < String , String > ( ) ; private Parser creatorParser = null ; private Parser modelSetParser = null ; private Parser patternObjectParser = null ; private Parser patternObjectCreatorParser = null ; private Parser parser = null ; public GenClass generate ( String rootDir , String helpersDir ) { if ( ! ( model . isExternal ( ) ) ) { getOrCreateParser ( rootDir ) ; insertLicense ( parser ) ; insertInterfaces ( ) ; insertConstants ( ) ; insertImports ( ) ; insertMethods ( rootDir , helpersDir ) ; if ( ! ( model . isInterface ( ) ) ) { insertSuperClass ( ) ; insertPropertyChangeSupport ( rootDir ) ; insertInterfaceMethods ( model , rootDir , helpersDir ) ; insertRemoveYouMethod ( rootDir ) ; if ( model . hasFeature ( Serialization ) ) insertInterfaceAttributesInCreatorClass ( model , rootDir , helpersDir ) ; } generateAnnotations ( rootDir , helpersDir ) ; generateAttributes ( rootDir , helpersDir , false ) ; printFile ( ) ; } else { generateAttributes ( rootDir , helpersDir , false ) ; } if ( ( ( ! ( model . isEnumeration ( ) ) ) && ( ! ( model . isInterface ( ) ) ) ) && ( model . hasFeature ( Serialization ) ) ) { if ( getRepairClassModel ( ) . hasFeature ( Serialization ) ) { getOrCreateParserForCreatorClass ( helpersDir ) ; insertRemoveObjectInCreatorClass ( ) ; printFile ( creatorParser ) ; } } <START_BUG> if ( ( ! ( model . isEnumeration ( ) ) ) && ( model . hasFeature ( Serialization ) ) ) { <END_BUG> getOrCreateParserForModelSetFile ( helpersDir ) ; printFile ( modelSetParser ) ; if ( getRepairClassModel ( ) . hasFeature ( PatternObject ) ) { getOrCreateParserForPatternObjectFile ( helpersDir ) ; printFile ( patternObjectParser ) ; getOrCreateParserForPatternObjectCreatorFile ( helpersDir ) ; printFile ( patternObjectCreatorParser ) ; } } return this ; } private void insertMethods ( String rootDir , String helpersDir ) { } private void generateAnnotations ( String rootDir , String helpersDir ) { } private void insertImports ( ) { } private void insertConstants ( ) { } private boolean repairThis = false ; public ClassModel getRepairClassModel ( ) { } private void generateAttributes ( String rootDir , String helpersDir , boolean fromSuperClass ) { } private void gernerateSuperAttributes ( Clazz superClazz , String rootDir , String helpersDir ) { } private void insertInterfaceAttributesInCreatorClass ( Clazz clazz , String rootDir , String helpersDir ) { } private void insertInterfaceMethods ( Clazz clazz , String rootDir , String helpersDir ) { } private void insertInterfaces ( ) { } private void insertSuperClass ( ) { } private void insertRemoveObjectInCreatorClass ( ) { } private void insertRemoveYouMethod ( String rootDir ) { } private void insertPropertyChangeSupport ( String rootDir ) { } private void insertImplementsClauseForPropertyChangeInterface ( ) { } public void insertImport ( String className ) { } public void insertImport ( Parser myParser , String className ) { } public void printFile ( ) { } public void printFile ( Parser parser ) { } private void insertLicense ( Parser parser ) { } public void setParser ( Parser parser ) { } public Parser getParser ( ) { } public Parser getOrCreateParser ( String rootDir ) { } public boolean isShowDiff ( ) { } public Parser getOrCreateParserForCreatorClass ( String rootDir ) { } public String getModelSetClassName ( ) { } public String getModelSetClassNameShort ( ) { } public Parser getOrCreateParserForModelSetFile ( String rootDir ) { } private void insertEmptySetDecl ( Parser parser , String modelSetClassName ) { } private void insertSetWithWithout ( Parser parser ) { } private void insertSetEntryType ( Parser parser ) { } public Parser getOrCreateParserForPatternObjectFile ( String rootDir ) { } private void insertSetStartModelPattern ( Parser parser ) { } public Parser getOrCreateParserForPatternObjectCreatorFile ( String rootDir ) { } public void insertCreatorClassInCreatorCreator ( Parser ccParser ) { } public String shortNameAndImport ( String typeName , Parser parser ) { } public void removeAllGeneratedCode ( String testDir , String srcDir , String helpersDir ) { } public GenClass withConstant ( String name , int i ) { } public GenClass withConstant ( String name , String value ) { } public GenClass withRunningConstants ( String ... names ) { } public String getFilePath ( ) { } public void setFilePath ( String value ) { } public GenClass withFilePath ( String value ) { } public int printAll ( DIFF diff , List < String > ignoreDiff ) { } private int showDiffForParser ( Parser newFileParser , DIFF diff , List < String > ignoreDiff ) { } @ Override public String toString ( ) { } }

Fix:
if ( model . hasFeature ( Serialization ) ) {